s=[1 1 1 1 2 2 4 4 4 4 5 5 5 5 5 7 7 8 8 8 10 10 10 11 11 11 11 12 12 12 12 12 13 13 13 13 13 13 14 14 14 14 14 14 15 15 15 15 15 16 16 16 17 17 17 17 17 18 18 18 18 18 18 19 19 19 19 19 20 20 20 20 21 21 21 21 21 22 22 22 22 22 ];
t=[5 7 8 9 8 9 3 5 8 10 3 7 8 9 10 3 9 3 7 9 7 8 9 3 5 8 9 2 5 7 8 9 2 3 5 7 8 9 2 3 5 7 8 9 2 3 7 8 9 7 8 9 3 5 7 8 9 2 3 5 7 8 9 3 4 5 7 9 3 4 5 7 1 3 5 8 9 3 4 5 7 8];
names={'选择1' '选择2' '选择3' '选择4'  '选择5' '选择6' '选择7' '选择8' '选择9' '选择10' '填空1' '填空2' '填空3' '填空4' '填空5' '填空6' '计算1' '计算2' '证明1' '证明2' '综合应用1' '综合应用2'};
weights=[];
G=digraph(s,t,weights,names);
 G=G.addedge(2,6);
G=G.addedge(3,6);
G=G.addedge(5,6);
G=G.addedge(7,6);
G=G.addedge(8,6);
G=G.addedge(9,6);
G=G.addedge(10,6);
G=G.addedge(21,6);
plot(G,'Layout','circle')
axis tight equal